electrical engineering MCQs – Page 52

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

electrical engineering Mcqs

1. economics of power generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

1021. A synchronous motor will always stop when:______________?
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A. excitation winding gets disconnected

B. load in motor varies

C. supply voltage frequency changes

D. supply voltage fluctuates

1022. In repulsion motor, zero torque is developed when___________?
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A. brush axis is 45 electrical to field axis

B. brush axis coincides with the field axis

C. brush axis is 90 electrical to field axis

D. both B. and (c)

1023. In a split phase motor____________?
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A. the starting winding is connected through a centrifugal switch

B. the running winding is connected through a centrifugal switch

C. both starting and running windings are connected through a centrifugal switch

D. centrifugal switch is used to control supply voltage

1024. An important advantage of a synchronous motor over wound round induction motor is that
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A. its speed may be controlled more easily

B. its speed is independent of supply frequency

C. its power factor may be varied at will

D. none of the above

1025. The maximum value of torque that a synchronous motor can develop without losing its synchronism, is known as_____________?
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A. breaking torque

B. slip torque

C. synchronising torque

D. pull-out torque

1026. In a shaded pole single-phase motor, the revolving field is produced by the use of_________?
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A. inductor

B. capacitor

C. shading coils

D. resistor

1027. A squirrel cage induction motor is not selected when___________?
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A. higher starting torque is the main consideration

B. all above considerations are involved

C. maintenance cost is to be kept low

D. initial cost is the main consideration

1028. In a capacitor start motor, the phase displacement between starting and running winding can be nearly__________?
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A. 60

B. 30

C. 10

D. 90

1029. The circle diagram for an induction motor cannot be used to determine____________?
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A. frequency

B. efficiency

C. power factor

D. output

1030. 5 H.P., 50-Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest ?
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A. 2880 r.p.m.

B. 1440 r.p.m.

C. 730 r.p.m.

D. 960 r.p.m.

1031. The range of efficiency for shaded pole motors is______________?
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A. 50% to 75%

B. 95% to 99%

C. 80% to 90%

D. 5% to 35%

1032. Size of a high speed motor as compared to low speed motor for the same H.P. will be__________?
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A. any of the above

B. bigger

C. same

D. smaller

1033. Rotor rheostat control method of speed control is used for____________?
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A. squirrel-cage induction motors only

B. slip ring induction motors only

C. both A. and (b)

D. none of the above

1034. In a shaded pole motor, the shading coil usually consist of___________?
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A. a multilayer fine gauge copper wire in parallel with running winding

B. none of the above

C. a single turn of heavy wire which is in parallel with running winding

D. a single turn of heavy copper wire which is short-circuited and carries only induced current

1035. As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for__________?
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A. mixer grinders

B. fans

C. blowers

D. sound equipment

1036. In a single phase motor the centrifugal switch____________?
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A. reconnects the main winding the motor

B. reconnects the auxiliary winding of the motor

C. disconnects main winding of the motor

D. disconnects auxiliary winding of the motor

1037. In case of 3-phase induction motors, plugging means__________?
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A. pulling the motor directly on line without a starter

B. interchanging two supply phases for quick stopping

C. starting the motor on load which is more than the rated load

D. locking of rotor due to harmonics

1038. A schrage motor can run on___________?
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A. zero slip

B. all of the above

C. positive slip

D. negative slip

1039. The value of starting capacitor of a fractional horse power motor will be__________?
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A. 200 uF

B. 400 uF

C. 300 uF

D. 100 uF

1040. For V-curves for a synchronous motor the graph is drawn between:_______________?
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A. terminal voltage and load factor

B. armature current and power factor

C. field current and armature current

D. power factor and field current

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